US1274542A - Spring. - Google Patents

Description

T. W. C. HARTMANN.

SPRING.

APPLICATION FILED APR. 21, 1918.

1,274,542, Patented Aug. 6,1918.

2 SHEETS-SHEET 1- T. W. C. HARTMANN.

SPRING.

APPLICATION FILED APR. 2?. 19m.

1,274,542. Patented Aug. 6, 1918.

2 SHEETS-SHEET 2.

MZZZ" f T/zamZZia m 6, W 335 f l proved spring,

7 leaf,

THOMAS w. C. HARTMnNN, [or rni anELrHIA, rnivnsvnvnnfn;

I Specification of LettersTatent. Patented Aug, 6, 191 8.

" x Applieationfiledepri1 27, 1918. Serial nazsrose. 1

lb allrwhowt md lcovwerh: Be itknownthat I, THOMAS W. C. HART- MANN, a citizen of the UnitedStates, residing at Philadelphia, in the county of Phila- .delphia and State of Pennsylvania, have invented certainnew and useful Improvements in Springs, of which the following isja specification.

'. One? obj ect'of my invention is to provide aneelliptic spring, .theparts of 'which 'can be made and'assembled quickly and accuratelylr 1 Y Another ob ect is to so construct my iniproved spring that it will be extremeh strongandadurable and: will be practically noiseless in operation.

I These objects, and other advantageous ends which. will be described:hereinafter, I :attain in the following manner, reference beinghadi'to tlie aocolnpanyingdrawings in WVhlChP-j." 3::- i I I 'Figure.-1-is':.ia front elevation of my ini- Fig;2 is a top'plan viewof Fig. 1, i Fig. 3"is atop plan View of one. of.

leaves of @the spring before the same is bent into shapep v 1. .Fig.-4 is aside elevation-f Fig. '3,

Fig. 5 is a View of the left end of the leaf shown in Figs. 3 and 4," Y

Fig. 6-is a view of the right end of said Fig.7 is an enlarged'sectiontaken :on

i the line 7'7 of Fig; 2,-the central portion of the'springbeing broken: away.

f-Fig. 8 isan enlarged sectlon taken on the line 8-8 of Fig. 2, the central portion of the springbei'ngbroken away," 1

Fig: 9 is a fragmentarytop planviewof' one end of-iny improved spring, showing the same assembled by a bolt and'nut,

Fig. 10 is afront elevation of'Fig. 9, i

Figs-1 21s atopfiplanview of theisprilng shown in Fig. 11, I

Fig. 13is an'enlarged section taken on the 1 line 13i+13 of Fig. 12 in which-the central 1 zportion of th'e spring is broken away, 1

Fig. 14: is ia'itopplan view of the upper 5 leaf f the; spring shown in 'Figs; to 13,

inclusive";

the

1 Fig. 15'is a side elevation of Fig. 14, 3 Fig 16 isatop planview of the lower leaf .of saidlatter mentioned spring, and

' Fig. 17 is a side elevation ofthe leaf shown in Fig. 16.

7 Referring to Figs. 1 toj8, inclusive,,of the .dra-Wings, thespring includes twoleaves 19 and 20. F Each of: these leaves is similarly constructed and is preferably made of strap steeland 1s cut at itsoppositeends as clearlyv shown 1n Figs. 3 to 6,-inclusive. This cutting forms animportant part of-my invention since it provides integral securing por tions for the leaves by which they can be pivotally connected .to form the. shape spring as clearly shown in Figs 1,' and, 8.

Oneend portion has a centralnotch 21 extel'iding inwardly. from its extreme end-22 and longitudinally of the leaf, as clearly shownin Fig. 3. This notch,for the greater :POIlll'OIl of itslength, is cut entirely through -.the leaf and is then continued at a slant or incline to form. an undercut recess 23. The

- notch 21 divides this end portion of the leaf, producing . twointegral tongues 24 and 25. ..-whioh'are positioned laterally or at either .-,.side ofacenterline dividingfthe width of the leaf. 1 The tongues 24 and; 25 are beveled asjshown at 26, said beveling-forming an un .dercutting orfscarfing w hich extends substantia'lly parallel" to the undercut recess 23 as shown in Figs; 1 and 5.

The opposite end portion of each of the leaves19 {111G120 is notched at-27 and 28 to provide a central-integral tongue .29, said notches being. extended toprov-ide undercut recesses 30 and 31, the innerwalls of said --undercut-recesses being formed by the continuation of the sides of the central tongue 29. The tongue 29 is scarfed or beveled at its outer end as show-nat 32 yandthis scarfed end is for a purposehereinafter described. The opposite. end portions'of each of the leaves ;19 are benttoj provide .eyelets as "clearly showirin Figsw'? and 8,'the bending at one :end of each of the'plea'ves including the lateral tongues 24: and25 and a part of 7 the undercut recessed: portion 23.; Thebend- 'ing of the oppositeend portions of-the'leaves i includes the central tongues 29 and-aportion iof the-leaves including. apart of the undercut :rec'essesi3O and-.31; It willi'of course be understood that the leaves 19 and 20 are bowed so that when they are assembled they will produce an elliptic spring and in assembling the leaves the eyelets formed by the central tongues 29 of each leaf are inserted between the eyelets formed by the lateral tongues 24 and 25.

\Vhen in this position pivot pins or bolts are inserted through the assembled eyelets at each end and riveted. The bending of the eyelets is such that portions'of'the tongues 2% and 25 fit within the undercut recesses 30 and 31 as clearly shown at the left-hand end of Fig. 7 Thus a portion 35 of the leaf adjacent the recesses 30 and 31 overlaps the tongues 24: and 25, as shown in Fig. 7.

The scarfed ends 32 of the central tongues 29 enable said tongues 29 to substantially surround the entire circumference of the pivot pins 33 as shown in Fig. 8. In similar manner the scarfed portions 26 of-the tongues 24. and 25 permit these latter tongues to substantially surround the entire circumference of the pivot pins 33. A portion of the eyelets produced by the central tongues 29 extends within the undercut recesses 23 and the overhangingportions 36 serve as a covering for said latter mentioned portions of the central tongues 29. Thus a .s win is DIOClUCQCl in which the inner ends of all parts of the eyelets are under the cover of the main portions of the leaves, and when weight is applied to the spring, the eyelets will freely pivot but there is no chance of them opening up since they are located within the confines of; the overhanging portions produced by the undercut recesses.

This is an important and valuable feature of my invention and springs made in accordance therewith will support great weight without breaking or becoming loose and at the same time a free and substantially noiseless pivotal movement between the parts is attained.

In the form of my invention shown in Figs. 9 and 10 instead of riveting the pivot pins I have illustrated bolts 37 provided with nuts 38 so that the parts can be separated by removing the nuts 38. In all other respects the construction is similar to that described in Figs. 1 to S, inclusive, and I have, therefore, given similar parts corre sponding reference numerals.

In the form of my invention shown in Figs. 11 to 17, inclusive, I employ the same principle of construction with the exception that instead of having both of the leaves similarly constructed, each having a single tongue on one end and double or lateral tongues on the opposite end, I provide a construction in which one leaf 39 has central tongues $0 at both ends while the other leaf vide lateral or double tongues 42 and 43. In all other respects the construction is similar to that described in connection with Figs. 1 to S, inclusive, and I have given the undercut and searfed portions similar reference numerals in both the constructions.

lVhile I have described my invention as taking a particular form, it will be understood that the various parts of my invention may be changed without departing from the spirit thereof, and hence I do not limit myself to the precise construction set forth, but consider that I am at liberty to make such changes and alterations as fairly come within the scope of the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is: I

1. A spring of the character described including two leaves, oneleaf having integral tongues spaced apart and bent to form an eyelet, the other leaf having a central integral tongue bent to form an eyelet and fitting between the bent tongues of said first leaf; and a pivot member extending through the eyelets thus scribed.

2-. A spring of the character described including two leaves, one leaf having integral tongues spaced apart and bent to form an space between its tongues whereby an overlapping portion is provided for a portion of the tongue of said second leaf, substantially as described. 9

3. A spring of the character described ineluding two leaves, one leaf having integral tongues spaced apart and bent to form an eyelet, the other leaf having a central integral tongue bent to form an eyelet and fitting between'the bent tongues of said first leaf and a pivot member extending through the eyelets thus joined, said first leaf having an undercut recess in arlinement with the space between its tongues whereby an overlapping portion is,- provided' for a portion of the tongue of said second leaf, said second mentioned leaf having undercut recesses at either side of its tongue to provide overlapping portions for the bent tongues of said first mentioned leaf, substantially as described. 7 Y

i. A spring of the character described including two leaves, one leaf having integral tongues spaced apart and bent to form an eyelet, the other leaf having a central integral tongue bent'to; form an eyelet-and fitting between the bent tongues of said first joined, substantially as deleaf;,and a pivot member extending through name to this specification in the presence of the eyelets thus joined, said tongues of each tWo subscribing witnesses. leaf having scarfed ends to permit them to surround substantially the entire circumfer- THOMAS HARTMANN' 5 ence of said pivot members, substantially as Witnesses:

described. ROGER WILLIAMS,

In testimony whereof-I have signed my AUGUSTUS B. CoPPEs.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0. p

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